During its existence from 1919 to 1991, the Ukrainian Soviet Socialist Republic consisted of many administrative divisions. Itself part of the highly centralized Soviet Union, sub-national divisions in the Ukrainian SSR were subordinate to higher executive authorities and derived their power from them. Throughout the Ukrainian SSR's history, other national subdivisions were established in the republic, including guberniyas and okrugs, before finally being reorganized into their present structure as oblasts. At the time of the Ukrainian SSR's independence from the Soviet Union, the country was composed of 25 oblasts (provinces) and two cities with special status, Kiev, the capital, and Sevastopol, respectively.

Administrative territorial division of Ukraine after abortion of the reform

With the Communist October Revolution and fall of the Provisional Government, the Central Council government extended its claims to all nine governorates where according to the 1897 Russian Census more population was Ukrainophone. After several failed attempts to take power in Kiev and despite holding cease fire negotiations with Central Powers, Bolsheviks sent an expeditionary force of Vladimir Antonov-Ovseyenko to overthrow the government of the Central Council. The Central Council in its turn appealed for military support to the Central Powers to stop the Russian invasion during which number of Soviet puppet states sprung across the whole Ukraine such as Odessa Soviet Republic and Donetsk-Krivoy Rog Soviet Republic eventually re-uniting in March 1918 into a single Ukrainian Soviet Republic.

With help of the German Army, Ukrainian forces managed to remove the Russian occupation forces. The Ukrainian government attempted to implement its own administrative territorial reform by reviving the long forgotten Ukrainian term zemlia which would replace the system of governorates and counties (uyezd). On March 6, 1918 the Central Council of Ukraine passed the law to start the reform. By the end of April however, Pavlo Skoropadsky with the help of German military administration in Kiev caused a coup-d'état establishing the Hetmanate. The reform that lasted less than for two months was aborted. The previous governorates were returned, while certain changes took places in regards to borders. The Kharkov Governorate was enlarged eastward overtaken territories of the east Sloboda Ukraine. In place of "continental" part Taurida Governorate, there was created the Taurida Okruha (district). Ukraine also received southern portions of the Belarusian governorates creating the Polissya Okruha.

Until the Riga Peace Treaty with Poland on 18 March 1921 the Ukrainian SSR had the governotorial administrative division of Imperial Russia and consisted of ten guberniyas. That administrative division was confirmed during the establishment of the Ukrainian State in 1918 when the Red Army withdrew from Ukraine following the Treaty of Brest-Litovsk with Central Powers.

In 1920-1921 series of territorial changes took place as well as changing in administrative division.

16 April 1920

Donetsk Governorate was created out of the surrounding Kharkiv, Katerynoslav Governorates and the Don Army Oblast. It was initially created in 1919, but with the advance of Anton Denikin its reorganization was temporarily halted.

It was during this configuration, that Ukraine underwent the first two five-year plans, (a consequence of which was the catastrophic Holodomor famine in 1933), and the collectivization and industrialization that they brought. In 1934 the capital moved to Kiev, and on 30 January 1937, the Supreme Rada of the Ukrainian Socialist Soviet Republic adopted its version of the 1936 Soviet Constitution creating the Ukrainian Soviet Socialist Republic. To meet the economic and social demands, a restructure in the administrative division was initiated, and 22 September 1937 four more oblasts were added to the existing seven.

The former was renamed to Izmail Oblast on 7 December 1940, and the centre moved to Izmail. Thus, in the prelude of Soviet Union's entry to World War II, Ukraine gained eight new Oblasts, which combined with the fifteen existing previously, brought a total to twenty three.

As the Red Army liberated Ukraine throughout 1943/1944, several changes were made including complete reinstatement of the existed oblasts prior to World War II. On 29 March 1944 the city of Chernivitsi was renamed to Chernivtsi as was the oblast. In a similar fashion Tarnopil became Ternopil on 15 April 1944.

The liberation left a German occupied zone in Crimea and Taurida. To facilitate the Crimean Offensive, on 30 March 1944, a new twenty fourth oblast was created in Taurida:

During the post-war rebuilding the administrative division remained stable. However the political aftermath following Death of Stalin in 1953 brought a number of re-organisation policies into Ukraine. Already, on 7 January 1954, a new entity was created in central Ukraine via donation of bordering raions from neighbouring oblasts, called

In the prelude to the 300th anniversary of the Treaty of Pereyaslavl on 4 February, the city of Proskuriv was renamed to Khmelnytskyi, after the historic Cossack leader Bohdan Khmelnytskyi, along with the oblast. On 19 February the Izmail Oblast was disbanded and merged with the Odessa Oblast. However, arguably the most significant change in 1954 was the transfer of Crimea from the Russian SFSR, and thus Ukraine gained the

After the political defeat of the so-called Anti-Party Group, consisting of famous politicians such as Vyacheslav Molotov and Lazar Kaganovich, a nationwide renaming campaign was undertaken. To ensure further disturbances of such manner be avoided, in early 1958 Moscow passed a decree not to name any object or locale in honour of a living person, and on 5 March 1958, the city of Voroshylovhrad (bearing the name of its native, Kliment Voroshilov) was renamed to its historical name of Luhansk as was the oblast.

Drohobych Oblast, being a smallest in territory from the start, since its creation has been continuously reduce in size, ceding three raions to the Polish Committee of National Liberation in autumn 1944 (including the city of Peremyshl). Another raion (village of Medyka) followed in May 1948, and losing a further 480 km² of territory in 1951 to the now People's Republic of Poland. The rural oblast also proving to be economically inefficient and was thus disbanded and its territory merged into Lviv Oblast on 21 May 1959. The latter would be the last major change of internal borders of Ukraine's administrative divisions until present day, the oblast count would stay stable at twenty five all right up to the republic's independence in 1991.

This arrangement would enter a stable phase right into the perestroika. On 4 May 1990 Voroshylovhrad would be once again reverted to Luhansk, along with the oblast. On 11 June 1991, the city of Rovno was renamed to Rivne, the oblast too. However, the most significant change took place on 12 February 1991, when the Crimean Oblast would re-establish as the Crimean Autonomous Soviet Socialist Republic, which it held as part of the Russian SFSR until 18 May 1944, and would declare sovereignty on 4 September.